[Shipping] Unable to export user data to a folder visible to the user

I am developing a music making software for Quest2

I would like to export the music created by the user as wav, but I am having trouble exporting it to a folder that is only visible in the shipping build.
If there is a better way to do this, please let me know.
In the development build, wavs are exported to the following folder.
/sdcard/Android/data/(Package Name)/files/UE4Game/(app_name)/Wav

(For example, is there any other way than modifying the UE engine to export to the MUSIC folder?)